ARITHMETIC 307 



PLASTERING, PAINTING, AND 

 CALCIMINING 



Plastering, painting, and calcimining are usually estimated 

 .by the square yard. Allowances for doors, windows, etc. are 

 not regulated by any established usage. 



Rule. Multiply the perimeter* of the room by the height of 

 the ceiling for the area of the walls. To this add the area of the ' 

 ceiling, and from the sum make such deductions as are specified. 

 Reduce the results to square yards, and multiply the price per 

 square yard by the number denoting the area in square yards. 



EXAMPLE. At 22c. per sq. yd., what will it cost to 

 plaster a room 65 ft. long, 22 ft. wide, and 15 ft. high, 

 deducting in full for 8 doors 4 ft. 6 in. wide and 11 ft. 

 6 in. high, 10 windows 3 ft. 6 in. wide and 8 ft. high, and 

 a baseboard 6 l / 2 in. high extending around the room? 



SOLUTION. 



Perimeter of the room = 65X 2+22X2 = 174 ft. 



Area of walls = 174X 15 = 2610 sq. ft. 



Area of ceiling = 65X22 = 1430 sq. ft. 



Total =4040 sq. ft. 



Area of doors =4X1UX8= 414 sq. ft. 



Area of windows =3X 8X 10= 280 sq. ft. 



Area of baseboard = (perimeter less 



width of 8 doors) X = (174-4* X8)X^|= 74| sq.ft. 



Total, after deduction =327U sq. ft. 



Area in square yards =327H-H9 = 363Jg sq. yd. 



Cost = $.22 X363*g = $79.96 



PAPERING 



Wallpaper as made in the United States, is 18 in. 

 ( l / 2 yd.) wide, and is sold in single rolls and double 

 rolls; a single roll is 8 yd. long, and a double roll is 

 16 yd. long. When cutting the paper, paper hangers 

 divide the rolls into strips of sufficient length to reach 



*The perimeter is the sum of the lengths of the sides of the 

 room. 



